Novel Fluorene-thiophene Copolymers and Polymer Blends for Photonic Devices

1 Results In this contribution we deal with photophysical and photoelectrical study of novel fluorene-thiophene copolymers, and thiophene-based oligomers and polymers, the syntheses of which are reported in our other contributions. Information about electronic structure of the polymers was obtained from cyclic voltammetry and absorption spectroscopy. The absorption of the polymers under study covers the whole visible region; the low band-gap polymer (Eg=1.35 eV) exhibited the long-wavelength absorption ...     

奇石:登峰揽月

正值我国“神舟”五号载人飞船成功发射和回收之际,特选此石以庆贺。该石为68×56×22(厘米);属渤海卵石,呈墨绿色,其中鹤、月、星、天河为白色;构图精晰,自然天成。象征吉祥的丹顶鹤以锐不可挡之势,穿越星空,奔腾银河,昂首奔向神奇壮观的月宫。寓意华夏伟业,不惧艰辛,勇攀高峰。     

森林生态补偿研究

森林生态补偿是个理论问题，更是个实践问题。我国森林生态补偿制度尚属空白，林业经济学界应重新界定森林生态补偿的涵义。政府因生态建设的需要，对非公有制森林行使公法上的征用和管制措施；政府对因此而给森林所有者造成的损失所采取的经济补偿措施，即为森林生态补偿。应运用马克思政治经济学和法学相关理论对森林生态补偿的若干问题进行研讨，制订非公有制林业发展和林业生态建设政策，以实现我国林业的快速、健康发展。     

1994年第五届技术创新“发现”奖

美国大型科普期刊《发现》杂志已连续5年对 有创新的技术发明颁发“发现”奖,我刊也连续3年 对此进行了报道。本刊在对1994年度“发现”奖的 报道中,除了报道获奖项目外,还增加了进入决赛 的项目,旨在使读者对国外科技发明动态有一个更 全面的了解,开阔眼界,启迪思路,对中国的科技 事业做出贡献。     

The dead-end elimination theorem and its use in protein side-chain positioning

The prediction of a protein's tertiary structure is still a considerable problem because the huge amount of possible conformational space1 makes it computationally difficult. With regard to side-chain modelling, a solution has been attempted by the grouping of side-chain conformations into representative sets of rotamers2??. Nonetheless, an exhaustive combinatorial search is still limited to carefully indentified packing units?? containing a limited number of residues. For larger systems other strategies had to be developed, such as the Monte Carlo Procedure?? and the genetic algorithm and clustering approach?. Here we present a theorem, referred to as the 'dead-end elimination' theorem, which imposes a suitable condition to identify rotamers that cannot be members of the global minimum energy conformation. Application of this theorem effectively controls the computational explosion of the rotamer combinatorial problem, thereby allowing the determination of the global minimum energy conformation of a large collection of side chains.     

MD Method in Solving Multiple Criteria Decision Problems Arising from Investment Systems

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